The invention relates to a lead sealing screw disassembling tool and a lead sealing screw disassembling device using the tool. The lead sealing screw disassembling tool comprises a tool rod with the axis extending in the vertical direction, at least one tool head edge in rotation-stopping fit with a tool groove of a screw cap of a lead sealing screw is arranged at the lower end of the tool rod, a cutting edge is arranged at the lower end of at least one tool head edge, and the cutting edges are arranged in a manner of inclining relative to the axis of the tool rod; the cutting edges are used for drilling plastic lead sealing to enable a cross tool groove of the lead sealing screw on the lower face of the plastic lead sealing to be exposed out, the tool head edges are used for being in rotation-stopping fit with the cross tool groove of the screw cap of the lead sealing screw, and the tool continues to be rotated until the lead sealing screw jacks up the plastic lead sealing; and then, the plastic lead sealing and the lead sealing screw are taken away, use is convenient, and efficiency is higher.